Hey Alain, can you give us a bit more information, because I don't have a clear picture of what's happening.
Here's what I get...
- you've prepared songs in rekordbox and exported them to a USB device
- you connect the USB device to the RX2 and load a song
- you can't pause the song (what happens if you do?)
- the jog wheel doesn't pitch bend or scratch (is it in vinyl mode?)
Here are my other questions:
- can you see the time for the track elapsed/remaining?
- is there a large waveform? overview waveform?
A video would help answer some of these.